Introduce an ap_get_useragent_host() accessor to replace the old
ap_get_remote_host() in most applications, but preserve the original
behavior for all ap_get_remote_host() consumers (mostly, because we
don't have the request_rec in the first place, and also to avoid any
unintended consequences).

This accessor continues to store the remote_host of connection based
uesr agents within the conn_rec for optimization.  Only where some
other module modifies the useragent_addr will we perform a per-request
query of the remote_host.

(Fixed compilation issues noted by Ranier, applies to 2.4.x trunk,
modulo CHANGES and ap_mmn.h)


Submitted by: wrowe
Reviewed/backported by: jim


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* Introduce SSLOCSPProxyURL in order to do OCSP requests via a HTTP proxy.
  Documentation to follow.


* Change entry and documentation for SSLOCSPProxyURL
Submitted by: rpluem
Reviewed/backported by: jim


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     lifetime when sending brigades and buckets down the filter chain

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